Need help to create Transport Rule

Hello Guys, 

I have Exchange 2010 SP3. 

I have request to redirect email to external recipient which is sent from specific Email ID to DL. 

E.g. 

Sender@sender.com sending email to DL@abc.com should be redirected to external@external.com 

I created rule but it is not working. Actually I didn't not find Condition "Sent to DL"  so I used condition "sent to member of DL" and defined action.

I checked tracking logs and found that event ID "Fail" source "Agent" source context "Transport Rule Agent" 

Can you please help me here to achieve above requirement?   

Thanks, Chinmay.